donno............
you don't! it is illegal. you cannot even legally have a silencer without a special licence.
One word: Communication!
I work in a music store with drumkits, and all people do all day is hit the things with headphones on...trust me you can hear it. If you put on the silencer and loosen the snare, it's a lot quieter.
Make the waste band looser.
If the silencer is made for your model and year of your bike and you service it regularly, it will not hurt horsepower output. Also, if you buy after market silencers, using the cheaper ones that fit a size pipe are not engineered for your motor, they are engineered to silence. many after market silencers create back pressure, this pressure makes the motor work harder, thus robbing horsepower from the rear wheel, its using some HP to push the gases through said silencer. Use the silencer that is designed for your motor.
it is called a silencer which makes the exhaust less noisier
buy adding a silencer attachment
drink medicine from the doctors office
you just buy the silencer
with a viza
look on youtube it is sure to be there